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/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2017 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2006-2010 University of Houston. All rights reserved.
* Copyright (c) 2015-2016 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2022 IBM Corporation. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "coll_inter.h"
#include "mpi.h"
#include "ompi/constants.h"
#include "ompi/datatype/ompi_datatype.h"
#include "ompi/mca/coll/coll.h"
#include "ompi/mca/coll/base/coll_tags.h"
#include "ompi/mca/pml/pml.h"
/*
* gatherv_inter
*
* Function: - gatherv operation using a local gather on c_local_comm
* Accepts: - same arguments as MPI_Gatherv()
* Returns: - MPI_SUCCESS or error code
*/
int
mca_coll_inter_gatherv_inter(const void *sbuf, int scount,
struct ompi_datatype_t *sdtype,
void *rbuf, const int *rcounts, const int *disps,
struct ompi_datatype_t *rdtype, int root,
struct ompi_communicator_t *comm,
mca_coll_base_module_t *module)
{
int i, rank, size, size_local, err;
size_t total = 0;
int *count=NULL, *displace=NULL;
char *ptmp_free=NULL, *ptmp=NULL;
ompi_datatype_t *ndtype;
if (MPI_PROC_NULL == root) { /* do nothing */
return OMPI_SUCCESS;
}
size = ompi_comm_remote_size(comm);
rank = ompi_comm_rank(comm);
size_local = ompi_comm_size(comm);
if (MPI_ROOT == root) { /* I am the root, receiving the data from zero. */
ompi_datatype_create_indexed(size, rcounts, disps, rdtype, &ndtype);
ompi_datatype_commit(&ndtype);
err = MCA_PML_CALL(recv(rbuf, 1, ndtype, 0,
MCA_COLL_BASE_TAG_GATHERV,
comm, MPI_STATUS_IGNORE));
ompi_datatype_destroy(&ndtype);
return err;
}
if (0 == rank) {
count = (int *)malloc(sizeof(int) * size_local);
displace = (int *)malloc(sizeof(int) * size_local);
if ((NULL == displace) || (NULL == count)) {
err = OMPI_ERR_OUT_OF_RESOURCE;
goto exit;
}
}
err = comm->c_local_comm->c_coll->coll_gather(&scount, 1, MPI_INT,
count, 1, MPI_INT,
0, comm->c_local_comm,
comm->c_local_comm->c_coll->coll_gather_module);
if (OMPI_SUCCESS != err) {
goto exit;
}
if(0 == rank) {
displace[0] = 0;
for (i = 1; i < size_local; i++) {
displace[i] = displace[i-1] + count[i-1];
}
/* Perform the gatherv locally with the first process as root */
for (i = 0; i < size_local; i++) {
total = total + count[i];
}
if ( total > 0 ) {
ptrdiff_t gap, span;
span = opal_datatype_span(&sdtype->super, total, &gap);
ptmp_free = (char*)malloc(span);
if (NULL == ptmp_free) {
err = OMPI_ERR_OUT_OF_RESOURCE;
goto exit;
}
ptmp = ptmp_free - gap;
}
}
err = comm->c_local_comm->c_coll->coll_gatherv(sbuf, scount, sdtype,
ptmp, count, displace,
sdtype,0, comm->c_local_comm,
comm->c_local_comm->c_coll->coll_gatherv_module);
if (OMPI_SUCCESS != err) {
goto exit;
}
if (0 == rank) {
/* First process sends data to the root */
err = MCA_PML_CALL(send(ptmp, total, sdtype, root,
MCA_COLL_BASE_TAG_GATHERV,
MCA_PML_BASE_SEND_STANDARD, comm));
}
exit:
if (NULL != ptmp_free) {
free(ptmp_free);
}
if (NULL != displace) {
free(displace);
}
if (NULL != count) {
free(count);
}
/* All done */
return err;
}
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